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Oil and Gas Assets (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oil and gas properties:      
Subject to amortization $ 15,707,000,000nfx_SubjectToAmortization $ 15,107,000,000nfx_SubjectToAmortization  
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 677,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative 1,300,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative  
Oil and Gas Property, Full Cost Method, Gross 16,384,000,000us-gaap_OilAndGasPropertyFullCostMethodGross 16,407,000,000us-gaap_OilAndGasPropertyFullCostMethodGross  
Oil and Gas Property, Full Cost Method, Depletion 8,152,000,000us-gaap_OilAndGasPropertyFullCostMethodDepletion 8,306,000,000us-gaap_OilAndGasPropertyFullCostMethodDepletion  
Oil and Gas Property, Full Cost Method, Net 8,232,000,000us-gaap_OilAndGasPropertyFullCostMethodNet 8,101,000,000us-gaap_OilAndGasPropertyFullCostMethodNet  
Accumulated depreciation and amortization (76,000,000)us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation (69,000,000)us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation  
Net other property and equipment 182,000,000us-gaap_PropertyPlantAndEquipmentOtherNet 174,000,000us-gaap_PropertyPlantAndEquipmentOtherNet  
Cost of oil and gas properties not subject to amortization      
Acquisition costs 469,000,000us-gaap_AcquisitionCostsCumulative    
Exploration costs 114,000,000us-gaap_ExplorationCostsCumulative    
Fee mineral interests 24,000,000us-gaap_CapitalizedCostsMineralInterestsInUnprovedProperties    
Capitalized interest 70,000,000nfx_CapitalizedInterests    
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 677,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative 1,300,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative  
Oil and Gas Assets (Textuals) [Abstract]      
Increase (Decrease) in Unproved Oil and Gas Property 760,000,000us-gaap_IncreaseDecreaseInUnprovedOilAndGasProperty    
Proceeds from Sale of Oil and Gas Property and Equipment 620,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 36,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment 630,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Granite Wash [Member]      
Oil and Gas Assets (Textuals) [Abstract]      
Sales of Oil and Gas Prospects 588,000,000us-gaap_SalesOfOilAndGasProspects
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= nfx_GraniteWashMember
   
Gulf of Mexico [Member]      
Oil and Gas Assets (Textuals) [Abstract]      
Proceeds from Sale of Oil and Gas Property and Equipment     208,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= nfx_GulfOfMexicoMember
Other Property [Member]      
Oil and Gas Assets (Textuals) [Abstract]      
Value of Assets acquired 33,000,000nfx_PaymentsForOilAndGasPropertyAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= us-gaap_OtherPropertyMember
72,000,000nfx_PaymentsForOilAndGasPropertyAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= us-gaap_OtherPropertyMember
9,000,000nfx_PaymentsForOilAndGasPropertyAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= us-gaap_OtherPropertyMember
Proceeds from Sale of Oil and Gas Property and Equipment 69,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= us-gaap_OtherPropertyMember
36,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= us-gaap_OtherPropertyMember
422,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= us-gaap_OtherPropertyMember
Furniture and Fixtures [Member]      
Oil and gas properties:      
Other property and equipment 144,000,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
139,000,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
 
Gas Gathering and Processing Equipment [Member]      
Oil and gas properties:      
Other property and equipment 114,000,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember
104,000,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_GasGatheringAndProcessingEquipmentMember
 
Costs incurred in 2014 not subject to amortization [Member]      
Oil and gas properties:      
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 349,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2014notsubjecttoamortizationMember
   
Cost of oil and gas properties not subject to amortization      
Acquisition costs 185,000,000us-gaap_AcquisitionCostsCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2014notsubjecttoamortizationMember
   
Exploration costs 111,000,000us-gaap_ExplorationCostsCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2014notsubjecttoamortizationMember
   
Fee mineral interests 0us-gaap_CapitalizedCostsMineralInterestsInUnprovedProperties
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2014notsubjecttoamortizationMember
   
Capitalized interest 53,000,000nfx_CapitalizedInterests
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2014notsubjecttoamortizationMember
   
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 349,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2014notsubjecttoamortizationMember
   
Costs incurred in 2013 not subject to amortization [Member]      
Oil and gas properties:      
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 177,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2013notsubjecttoamortizationMember
   
Cost of oil and gas properties not subject to amortization      
Acquisition costs 159,000,000us-gaap_AcquisitionCostsCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2013notsubjecttoamortizationMember
   
Exploration costs 0us-gaap_ExplorationCostsCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2013notsubjecttoamortizationMember
   
Fee mineral interests 1,000,000us-gaap_CapitalizedCostsMineralInterestsInUnprovedProperties
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2013notsubjecttoamortizationMember
   
Capitalized interest 17,000,000nfx_CapitalizedInterests
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2013notsubjecttoamortizationMember
   
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 177,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2013notsubjecttoamortizationMember
   
Costs incurred in 2012 not subject to amortization [Member]      
Oil and gas properties:      
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 41,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2012notsubjecttoamortizationMember
   
Cost of oil and gas properties not subject to amortization      
Acquisition costs 41,000,000us-gaap_AcquisitionCostsCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2012notsubjecttoamortizationMember
   
Exploration costs 0us-gaap_ExplorationCostsCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2012notsubjecttoamortizationMember
   
Fee mineral interests 0us-gaap_CapitalizedCostsMineralInterestsInUnprovedProperties
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2012notsubjecttoamortizationMember
   
Capitalized interest 0nfx_CapitalizedInterests
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2012notsubjecttoamortizationMember
   
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 41,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2012notsubjecttoamortizationMember
   
Costs incurred in 2011 and prior not subject to amortization [Member]      
Oil and gas properties:      
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative 110,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2011andpriornotsubjecttoamortizationMember
   
Cost of oil and gas properties not subject to amortization      
Acquisition costs 84,000,000us-gaap_AcquisitionCostsCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2011andpriornotsubjecttoamortizationMember
   
Exploration costs 3,000,000us-gaap_ExplorationCostsCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2011andpriornotsubjecttoamortizationMember
   
Fee mineral interests 23,000,000us-gaap_CapitalizedCostsMineralInterestsInUnprovedProperties
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2011andpriornotsubjecttoamortizationMember
   
Capitalized interest 0nfx_CapitalizedInterests
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2011andpriornotsubjecttoamortizationMember
   
Capitalized Costs of Unproved Properties Excluded from Amortization, Cumulative $ 110,000,000us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
/ nfx_OtherCapitalCostAxis
= nfx_Costsincurredin2011andpriornotsubjecttoamortizationMember